Possible Clues:

• Maybe, bleak old tutor a few disrupted is one unsuited to situation (1,4,3,2,5)
• Someone ill at ease, a type that's got hooked? (1,4,3,2,5)
• One in unfamiliar surroundings, as 21 5? (1,4,3,2,5)
• One of those not comfortable in new environment might be a good catch for someone else (1,4,3,2,5)
• One uncomfortable with top-class swimmer having no pool? (1,4,3,2,5)
• Misfit, in a phrase